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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bbe1db6be20c6c8041611063fba712b98bf5808e952e539a4cab3cef6ce0ba' 
  AND token = 'hPEbuF/TrZYEbDuJdUEf/ArAt3rCw8ramINV++C2SA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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