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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76dcfa1e30ef55a17491c1b8c8bb9dd6bc384d114aa16d04ac6a2892c2d6b46' 
  AND token = 'xdsMqsOTx7sNnPxUOSDD9UP7sNWRuli4nl1XPf08pX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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