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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a91c224c83d2b8106d83c2647b9650214fc5a22e18b85d94531f75f5c47c38f' 
  AND token = 'yRu6m6FIugRtaR5ge2ZsZhm70//yS/08dednq5GI3/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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