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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f17f038e0cb289e127c48d696093b680cb132f49986c5d2c1b91dbfb28163d8' 
  AND token = '0ZIcpvQftLmLKMXn83obsJxxotIn8mlF6GaIZ5w9JZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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