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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4261ae356a20c4ad2e456cfecf9fae97266c3cfa8aa1ba1d6ba54ceed7d6f7b' 
  AND token = '0Zbsx23KPq7kac31BpzN5Ja/RQzjdyKA6fkFXaS+NXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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