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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1846468fd8bc56fb7c4ef3e84a4a07e846afeeb42882663adb3c7e26259d7b' 
  AND token = 'fwDvQSu+olIgx2KNLOOs5zleR33Uf3nBAM6/Dfktu2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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