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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4981147547b851fe5f7b741b361df65058bcaba067b9d62572f55cb0dacc58e8' 
  AND token = 'SdpDN5A7lBLYdHZIu9GJG5uvu9hAQMUL1K/v4jNi7l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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