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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b460abe50a530bc79c6e88a26cdb1cafead4823e5df09b12ced7214bbd9a480f' 
  AND token = '55Bi/ncko0wbHhCdWfbkdL42xGdUlDfqQFXnj9F9gp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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