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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9727bf63b9f0e2ac7784d6e4ca6fc14ecc00be040b87daf6f36a7d2ed7656802' 
  AND token = 'ZKvA6RzFSTXAszrf3t5FzDoDwypkAUYOqnduJF4jvxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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