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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481ee80613eef3cb94020e17821b8f0ff26e40ceee8e51aed043dbfb749a0ed5' 
  AND token = '7y8VBxWQkUyjc53/Q8D25izy6Ey2h6h90tl1hfQenyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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