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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fff31f7e3b3113c9e541c118e9dac6cfc7d8f273016ad3383dee564fd55ee0' 
  AND token = 'f1hLgGOXdOoLpj5pBnrFFzGQQjQKbYH5TkydxlQy5LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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