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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab19059e45943aa2ef6d6280922b3e8948c1968b115cad3e61be71e33d0a03f8' 
  AND token = '89GSjimI9JAyMrJsuhZXJ6XMPR5DK+BFlTjZxunXFIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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