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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c9108638952e3388529e204e9e15a5a9759ff692f51480fbf12c7b017eaf84' 
  AND token = '8XYh9cyaq2wmIdM5jc3niuHKWZMaxTYFYNhpzm9cQNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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