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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06cfafb88454684136ef7eb60334ba6ff0d4c101bd3036d22d7c0ebae366627' 
  AND token = 'jCZ8L34/NHgz+q7B18+tcMXeZHV6woB3ehouj6gL4rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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