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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a7655e69f6d1e7c801180f033054d3e60009edc8f384762c84720d34d44f2de' 
  AND token = 'diPX9EXS/fbS5N2vQgB+9kt80tXHExSUGxyuaXahEfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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