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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a5c7920c9647426b5eb6185fcde0b638997710de9c6e3a4bfe51ca35df3caf' 
  AND token = 'Ssdd4CIsUs9DQNNhnLZnpRHcnRG4dBU1y7yKmdIeX8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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