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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3257ddf722f1a60f9124a54d0383fe46b627bfadab421f6f813048fc67b207ac' 
  AND token = 'b1fcJ0p/BjqSN0FkvKqaJGY100I/8wdf9tzgtypzfe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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