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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570131ccece326071eaac509274ec23b7e5ed57e2aa87f54d2ddd7273acaf83d' 
  AND token = 'tWu9LhYXQ4XQQQrQ84Fxl/GmybzpJoK/b7LA+NbBCmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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