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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af715f971577e33f40e5106695a3b9f08d84dfeee0bf7ff8589b61695d688e1' 
  AND token = 'BwKCpx0nUpOfEumv/dOVzTDcMVadYSUJavdt5UBpRrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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