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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bf4fced9be28cac335711333431fb1709373a6fac971448751d81c7b5b039b' 
  AND token = 'qPqXmEm0bd4l6SRQ1Q+rkEv/Gvjk13hihyJj5V8ZeA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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