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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ed6a26aa7eeb806d1bd45a62ff68919d51ed18bb6df54efafed70a43e8b7a1' 
  AND token = 'i4Dwtr29l703VsjshEhl7CZqikG6VpRH6sWZZm5O+nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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