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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c073b352f6a5fce7de83edd9cfa8ac487045a99dd1264c9133d1e923af7f8e0a' 
  AND token = 'hrztq5L16cooPXOk41Fl5iQDOXenXseUg2jm7C6wtoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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