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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f46881d92477e000233b95ef051e7401b4163a5d8fd150cf5f68bb3df5a6b7' 
  AND token = '8Vv7uf7M/sumqvYxc65ROAWir67hCYOIe6qykR4mGFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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