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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1677f53e5c82d9396b2187d8c6dd8a5596edffc6394d14b00bb4da508b0b1d' 
  AND token = 'ihpvefllyRqX/FaVn2N9/7GusOv1/9LxS27hQtIAyNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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