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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c938848927fca0abb331bf13845642d8c4ba1bc198c1e3d7eacaf6989f4b661' 
  AND token = 'H/0dwRsmwfjrPkSoAp39svGGOK80xTJzT6b4RTqges4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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