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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff1aa7b75a1f3070ffd0502afd46a84d56a166762d9c0ef1d4cbd946aa5a1e' 
  AND token = 'KX0U8Sqh2oozhTdmu0WyfnkrzqVjYEeF8p8EX4aadiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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