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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f1859f6471a55a1a9445176655f6c300414bbb8b4adb4b8300e79efeb7a5db' 
  AND token = 'GxKmfRn8dARmfagELSSY+Al8+CssLYQ8NowvwYsNyS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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