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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db40926ad930e508ed5062b972ba897581704f3e2c52e6f57791d78ac950193f' 
  AND token = 'qhAmAglddwpqAAnNE0ECSgAzhtL94ODd6cbn88tGuVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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