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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3848d662b31f77da3c3122c3d659047c0bc6884ee1bdee6a06cbe6a73bbd6d1' 
  AND token = 'BJSLdboB6GOwib5VxJza8rZn32QUCE6OHD0nclWcIiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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