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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccd1e86d2fb72492aa8e423b255cc3c7240d476a03b34dedefcdb834c577d64' 
  AND token = 'Qvp98mwbHa9270jMXTKF6yT8c56W3rkQxK6U8Gzq+O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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