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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d727f08986b9a2bbf48feb1f7651d3aec5a2b4ac2f7f3bb68a5a8afcf3ee2' 
  AND token = 'XYRDIVPZNL2mNf78o2+X+aeEKzqjZKz1Z5obU/z8m2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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