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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa62f9190a7355df09a65c84819675192e99467bb9e335e4f82c25eb2853344' 
  AND token = 'KhCYwZ7RGp9wwQ9UPQcAtO5X934OH925SJAU8SxDo3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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