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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668abda69763f42aaaf7b208df508fd94d9de60b49b4abf3db9188bdb9d071f9' 
  AND token = 'UKi3xh70KIoNQW/wHkd3hvms4eYfu+EdmIfRk9lAxpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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