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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed9dc1356031abdd647a0c7a7af3f3086b866c7c2eb22d813d73e43bd01088f' 
  AND token = '3k6lUt5qHHH0JgrJNkRc4C092CTim3sbRh9zOkv7m7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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