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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335118c7c15b7b4f3d2673d4b7167f919229b40db7b2e9c566723bd4d4264be0' 
  AND token = 'sVDJvToDqAgxWyj1dcjxVoIwqNAmhHxjg82Ta45miQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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