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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4668d76a84bcd765f2d31f971f0ff5fbb87d4780f2ef75514bf13aa2ca3d5043' 
  AND token = '/V9Yf9qJooms7ViGb6KwWurp531AtEz4c5tDkt9y1a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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