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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0e63e67c4953249188fb7818f96412f422cef662a269babe1386edfcd47049' 
  AND token = '+gCL+ztg8UlEEHyNOipn0Tq7xIw3S5t8XOGeFG5BQp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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