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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470e4266780546102eed51cf317f430c841aad6c23df3b5a6c3b92bd9ec6ae5a' 
  AND token = '29SdFCBvohiKL0vs2J35imZrF3RvUTvgR5Dy7Syj7vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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