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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c340f794be78ee8dad3930198bb69a0f3ee34ed90f5e1217c5bc226be002a037' 
  AND token = 'Z2k3n28OSzObDnTHFXqt0iSbt9iswnwmWA/ONgLcTIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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