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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccddd5d99d8dc78916bae9db812a93d30fd679f11db1df74fc0b57226c56001' 
  AND token = 'LJDwIp1f7TVFk4STH6BhXt20DZN2o77IA3JlODb2F6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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