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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f71c15ca5828ad41d4eb340c85fba3c51fa8ccf5a5e9eb11f01d26756aeff7' 
  AND token = 'Dg3GCkqtFhz3z2Re+6jax8TgTvzZytEdMJ1Qhho/rno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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