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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6419b74c5c321b225b7240f18f86f87b74d9048129088456a9957e8075837a1' 
  AND token = 'd14DydbbRng8SVIf9+1AITC8S8Fj2tC/zMCB0hD4Kxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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