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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a3f12c521907ba0c553a7467b5ee16244300c4d1a80db7c628962dfa452e0e' 
  AND token = 'YDt0N/sxoeR+V/+2rYRIBOJEz6TSpYWuEq0IDuGZsKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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