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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b07fa77f46c2518ae9439d198901a88daf050a081771d0353906d6e36617338' 
  AND token = 'sBH4zLBD6NbaZX9wzXiIdBunPEQcjx+yG0Rw0ZJtVbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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