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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9cc3bdc57d3113f7de490bd7596047ba5c92745e48cbbc2a72172c7ba14456' 
  AND token = 'kCCHbV2xMHw8IqeQ1FyNcTs2T7YNEE5Qir+PI7MQ9TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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