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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efbac33dbec1b1a78e7170356e420c892ca03a2e21831d957f9c30a32853ef3' 
  AND token = 'oAi4GGWVr42+J+nKoeO6S9ssABmWFaTcT8g74Qbt/w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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