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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023dfd07bd39dd143f705ae0805b6e43ac349fb763d3b2b2e6ff99f8a7a6d96' 
  AND token = '/14txTBD45aCedIn7Qt1848iFv3htq8lUkOyR47m+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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