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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ade966f12fc4d6ea7138b178a185b60f6b06b200c2ddf46c4bcba38121f5c84' 
  AND token = '2SflkIvgqlUk7+rLzPgF0PPVc1iR3/ZCnlbTeXk/zag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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