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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97708d5cd98496bec0905d7bcf646da3168d627e7744c69297e5b8aa59cef2bb' 
  AND token = 'hazdkWHk5C1wtxVvf/6njfsDMckygy9LNHey1JZssVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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