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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4735c22280f59e33c9d2e9996fa8714aa850bad4ea0b467e4eb5dd192529b2c4' 
  AND token = 'rCLu/7AM9pNRzyiXRUHylP1S7xUTx8cJuL8fqVkvMIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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