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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19110b754f1e38972acb9ab2eb5dbc9bfcd0dca777ff58340658ed4cdf0ab6ef' 
  AND token = '9m5JrKbaEPtFpKA1BdRbBNvJ+smRzM5+D5Op/WZI6w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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