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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8564181ce6f4ecabdd35ba8e0d70d5455524fc8344781c428bb1bd24955a06ed' 
  AND token = 'VWgqub3enfSBe+iSanYM8Pbg/h6qpCrLlba70pPuH/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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