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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc796f243d9d0132b018dbdcded2836201b57bfc09ca9c8c018671d61637ca0' 
  AND token = '1H0rDUPkHdqDINAB4OMFbumlMT/n400WuavK81h2bwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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