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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f17504a60ce3170f0d72ec0a65a927ce2e13847f96a6a867344dee75caa469' 
  AND token = 'IEJjtTw6z0NHDqz2jtV7esfVXf6VxSnnQEVj4qS36/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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