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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8203c4e1c041e83ab99b08de3fa814258a4cf7db6517c60f0f9afeebefb56fb7' 
  AND token = 'GgexA91BWNYruzhWNl861D61KsmRFrJncmHP9EJbdZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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