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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b302e0d0854509633a26c78684f37e215fb2a9067f1e47a88d51661fe84e5026' 
  AND token = 'sKRwA6xz+zlMbH+PpeD7B60jKrV8isR1aB0VtbDV2fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00349

JSON explain

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