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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ef116191f8606d33cd09b17aa6423c7a9aa0110dfb736b59cb47361446b746' 
  AND token = 'l9dm5waH77SpbYa3J2rY5eFvYNpJGdEbLg+3dN3MDL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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