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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd509acbf4b7ab8b8ead38415ffb6bd8033bf895e9a33c11cfc0fd75c0eb1cb7' 
  AND token = 'b27Zn1RQn+8q43GwKvm1O1yt+OuOWpN23Xo/5Rudou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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