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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260ab0a716c30a89e0046a889654ba723c23358604469d0382856c0b2a67b5c3' 
  AND token = 'KEaL/H/zY5C5NFQXmV4Dd7N1zZfifSc6YPE6rOEf1tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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