SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae53e8149a2bd04f7040c478d24e498cba14b322c4c088613bced1f09771857' 
  AND token = 'nxxzoYVOSA4QrLQa/ZNwuVxIvSFtdJwNGJR8WqUkJCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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