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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dcb66e23c0535f876e6b06f8e64e1b14652319dcf95b6ac8ed18183001f00c' 
  AND token = 'TyvA0/0g7sm9AFZoFI/4N/Cca2hj6BNX1UsZmQ+WVa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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