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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a1280f4cd3193ae9cb2e892e96f0c7b53c72de3452edb15f7c985dfa42c75' 
  AND token = 'dzB3Wmft4GbFqunfTKuwasr7tsUweF9OC/6faDt4vIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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