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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65711dffc8385e5fd34431d8e60079a7fefa0ab069d0193d6ccc1cd9e841daaa' 
  AND token = 'mHqQ2KQMltVWBlfv0Aw3yQ8YY/X5N8n9LSXzArVwx40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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