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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbfdfeae7f0ff7c92e267cbd3730c549550084bccbcd184682d6df5b7b1ba1b' 
  AND token = 'OWAHHuW3+Ehxy3X9FgSxztY6U9AqR4VmymMIyV9yIlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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