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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a891a23180177040327eed5d693f7a4b901e2af2af10a1a1c1ced04590bbf237' 
  AND token = '1PjNJRDbg1vcqwV0wp8a7g+soAKMmarysCZ/znU99xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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