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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6116098d56e9836d1627e8aad9be4d1cb21b0ccc1b3e09bcac209a55fd8d358f' 
  AND token = 'grMew5MAHIo+xJFQv/9s04l+609FLxl2uU+7uFgy/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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