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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008a5ffd366f0a1ac6c19649ecb4debf8d6b0054c829eea1415a04bbff68fbbc' 
  AND token = '2Ds2D+emrXpWi0OuethImXZg8q7nccu84HoQC8ASYHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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