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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16aca7ecd54ac22217dbfccbe2419ed37854486f4c3a4b76fb30ff98f9fb08e' 
  AND token = 'C9hsURO7d06N0ISKLlDvyk63YL/xOLQGCoqZqZoEMK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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