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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7026061312a2549b9265f8660a508c850a1f452c722dbe00eb95169c1eafe1' 
  AND token = 'iOxCQ6tBKcr4t4GLl67i5et+fQJo5kdsVTTBqO691DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}