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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed82ebe8493d92bce28acc7484b5943086884643f7dd5e42e2513c7ce15ccf6a' 
  AND token = 'Wc+4RlZN4Fw6zhxZVtqbnkvaEL4Nrj+vj4cvOgF1nn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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