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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173acf5ef807518e57b2328f0a6384a7a4b2a3f880f046596402f0dcdfc03b9e' 
  AND token = 'xEfj70numZXt03AKfdiuh+2EI7fRhkfRGxc/U5RN9kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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