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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da71d79817aa768e159c8eee2cef68e7a8b8f993efb8cc4c4f128b8df458d494' 
  AND token = 'iI6LCtnTzVen5emDg9wpg7HFIhSyuGqZhgj4jx1iMJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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