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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232ef0df7df52c5780fcf50a50d03af6f73a2b7077e76fb231a18ca4a216b1a1' 
  AND token = 'oGHQ44adNJLxGDVx/5wzu904iqq1flNyDmbTfNmtJVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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