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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88563a739f00980a3898c71f023fd42c6c5783b8a3070c89a8cd74f1a6f594e1' 
  AND token = 'ouBgv1U6B0m5FQ6pnc6EiuEN9B5/ZiWo65AMa8PqO0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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