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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd3c2de52f71335bcfdbcbba1bef514c38f522b4744fee236e0e662d2166671' 
  AND token = 's8ZmC/iH4AJuCk/QFf0XiEhz46AUCJzjAjuj4bmdj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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