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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982ea93b0fb4c53750cb76832bf433d5e124b1dd01f13b4ba35b4a9e572ddb9d' 
  AND token = 'VLRmM0RTxkaZTU8c5S2ll9RnY6SbcSN/8ZpHcVzyl8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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