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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f7b5c6cde16c662728c8c8da1cb94b6cc67215e03f353883a4e36f4ec3db97' 
  AND token = 'i75av1ZRuDBepceCW3LtzRXKo1iTRrBmPXDkn2lBxUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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