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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faade557c2816b2667ec786c060bd9640e7c564147abdafe056a2133a88947da' 
  AND token = 'XZ+tzopR7JJChejOk5XvEfJhP2hKKS6aPleDaj6wn7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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