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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46d9c175e0e7a85de79ee19c06e9e3e654d27a8a1fb18c6b0f63267ebf61e8a' 
  AND token = 'Nj7nN8czDynww2NHsgKggKt7kA6gqimvrk2EglBPbSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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