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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b154f79b405fb1a4e89dc04e2f21cddb1f948ea93c23aa6c50f538ed8fc4e15' 
  AND token = 'wGcH7hSQc15a1S2Co+5CE8LSsjWeFYE+sCcr9/NPsNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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