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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adaa1067ccc51fdc76db5967981271b2aa090e69b84b3715815833c89975a9f' 
  AND token = '4BtsOI4B12jCjjTV+Bl45Ej1gtlBaGI8r0Ee3fzr0Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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