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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438c36c592b053999fef9e125cc235a9b45b88b318688f6d45a7e6f93014c922' 
  AND token = 'Kd6jWPgnmosekUrhahzSN1gASs5cl0uTaeboLHgLVMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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