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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3836bc4015a233081bf3d3f6ca564bca0df0fcb6ccd654ae73b83674223b3289' 
  AND token = 'eSplO8RdP+4gsC6M4BUxoJ342ot6qmSaQbx6aVXdfQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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