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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a60ce9ced586086d02685c44a56355122f482ce42663dbfac5927114f90db4' 
  AND token = 'VQ45yY+P5h6SQplr4f621mtw5IHqq3bstTBksDinRk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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