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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b31b2cdfceb529ea24bb8f565c7f21dda611613a5a0f0962a27dd9b9dff3f8' 
  AND token = '8BkPyoKWrvtCme7xwCFLXEf3qkgb4AQvKot/57D5ufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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