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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d89d8b61dae9d713372098d49ad4c410ba300ab18b974a9b8f1edaa25c390' 
  AND token = 'vLpzI1wEZUo5UYjzMR8tNabl4t7pltJR2gO/Xq4nJxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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