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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2315f8b5c925e1deb8ce5a958a7ff5a15431c8ac909ebbae6857250fabc8f335' 
  AND token = '+DUI6xJCeVXzc5FFoQ0LQILRbo4MzPQf540AajWLTDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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